Furnace



July 25, 1933.

J. G. COUTANT FURNACE Filed Feb. 23, 1929 INVENTOR:

ATTORNEYS.

Patented July 25, 1933 "*hmhh STATES mm or-m: i

, JAY GOULD courim'r, or NEW YORK, N. YL, AssIeNon 'ro FURNACE Emmmmmoom- IPANY, INC, on NEW YORK, N51, coRronATIoN OF NEW YORK i FURNACEApplication filed February 23, 1 929. SerialiNo. 342,039.

I This invention relates to furnaces, its chief utility being inrespectto furnaces for heating steam boilers,.and particularly furnaces firedwith pulverized coal or similar. fuel;

The general objects of the present invention include the generalimprovement in the efli ciency of firing of furnaces, while increasingthe thoroughness' ofcombustion,.;rate of evaporation and the-durabilityand economy of operation ofthefurnace. Further objects.

and advantages of the present inventionwill be explained in thehereinafter following description or illustrative embodiments thereof orwillbe apparent to those conver- To the attainment of line m-m of Fig.1, showingthe relation, in

thewater arch, ofthe tubes and the closing wall'members. 1 1

.Figs; 4 to? are corresponding cross sections" showing four other 1different. structural modifications.

This application is claimed to bea con'- tinuation in part of my priorapplication filed March 5, 1925, upon which patent isabout to issue onFebruary 26,1929, No.1,703,814, and

of my copending applications Serial No.

60,435, filed October 5,1925 and Serial No. 176,137, filed :March17,1927. y v [In the prior patent the. fuel is shown in Fig. 4 as beingintroduced at the left side of w the chamber beneath awater cooled,arch.

The fuel is in the form of pulverized coal in suspension in air, forminga flame directed into the combustion chamber, this ..flame entering thechamber between cooling surfaces bothabove and below, namely the waterarch above and a water cooled floor orbottom below.- Figs. 2 to? hereofcorrespond substantially with Figs. .to-14 of the prior ash chamber orpit.

patent. The formof burner or pulverized fuel injector as herein showndoes notcorrespond with the form shown in the prior pata ent, butcorresponds with that shownin an other prior application of mine,although either burner, or other burner could be employed in the samerelation.

The furnace is a boiler furnace and isshown as enclosed between a frontwall 10 and side walls. .11, and an opposite rearor bridge wall will beunderstood. The'side 1 walls are of a type having water cooling tubes 12in the upper pa'rt'of the chamber for progressive cooling of'the' gasesascend- I ingvtoward the boiler. Below is the water bottolnor floor 13shownas comprising wavter 'circulation'jtubes 14; for" the cooling ofthe'flOor; As in the 'priorpatent thewater bottom is inclined andisprovided with'jets' 15 for drivingsettledj ashes downwardlyinto the ashdischarge pe n 6l d p In the-front wall 10 is shown aburneri 18; whichmay be considered asrepresentativef of aseries of, burners arrangedalong one or more walls. The burner may be of various types, but isshown of a type describ d' a prior application wherein areja system ofpension in airfor delivery laterally into the tubes 19 bringing thepulverized coal in-sus- I burner anda nozzle 20 at the outer end'for fdelivering, forced draft air longitudinally into the burner. Thecombustion starts withe in the chamber 21 of the burner and theflamei isdelivered atthelm'outh or delivery" point laterally into the combustionchamber of the, furnace.

Above thecombustion chamber-is shown a. water tubeboile ri24 havingbafiles 25 of a i J usual sore, Between these and the front wall l.0-isshownaniarch '26 and for the purposesof this invention this arc'h,.whichis arranged radiant heat,; is provided with water-circulm.tionpassagesor tubes .27 arranged for high the fuel admission point, andexposedto the. 1

a5 a heat absorption. n willibe, noted that the;

arch'26 is-slantedupwardlyawayirom'tM wall through which the fuelisadmittedand the bottom 13 is slantedidownward-ly; away from the samewall, so that in efi'ect thefuel V is injected into the water cooledflaring side or extension of the general combustion chamber.

The water tubes 27 of the arch are shownv as supplied with Water by adowntake pipe 28 leading from the boiler to the lower header 29, thewater passing thencethrough the system of arch tubes 27 and from theminto the upper header 30. From this upper header preferably take-oflasystem of widely spaced tubes 30 forming a slag screen subto'ry flanges.

2t 32 'between the tubes. An outer refractory layer-33 is shown, whichof course may also be employed in Fig. 2 or 4. I

' The blocks 31 and 31 and their depending flanges are preferablycomposed of 'firebrick. refractory. Thus the radiant heat is directedtoward the tubes 27 and toward the refrac- The flanges "protect thetubes from excessive heating and'destruction. The flanges also preventexcessive absorption of radiant'heat and thus maintain a suitably highflame temperature at the delivery of theburner. The circulation tubes inturn' protect the refractory elements and preserve the arch fromdestruction, while greatly enhancing the total evaporation, andpreventing the ill effects of excessively'high flame temperatures. r I

Fig.4'is similar to Fig. 3,.but with the depending flanges of the blocks35 cut off to expose the tubes substantially to their diameters. y

In any of these constructions, the interposed'blocks might insome casesbe con structed partly'or wholly of metal, or the tubes .might be facedwith metal, or other I high heat conducting material, but as stated thepreferred arch presents a'combined surface of refractory material andwater cooled tubes to the radiant heat. 7 :In Fig 5 the depending blocks36 may be composed ofmetal and give dove-tail support to silicon carbideblocks 37, representative of any high heat conducting refractory block.In this case the blocks are arranged substantially to cover and protectthe tubes, but to deliver effectively the absorbed heat to thecirculating medium. The block 36 is shown supported from a backing 38.

' In Fig. 6 the blocks 4:0 are ofmetal, but otherwise similar to theblocks 37 in Fig; 5. The blocks 40 are. secured by a' clamping device 41with a rear metal bar 42 below abacking 43. -InFig. 7 the constructionissimilar but the metal block 40 is providedwith a silicon carbide faceinsert 45.

The operation has been largely indicated.

The burners deliver 'the flames laterally or horizontally into thegeneral chamber. They sweep across the chamber and then swing up throughthe temperature reducing zonesurrounded by the tubes 12, and thencebetween the tubes of the slag screen 30 and into the boiler passes. Withthis invention the progressive cooling of the flames commences shortlybeyond the exit of the burners due to the radiant heat absorbingsurfaces or waterarch and bottom above and below the flames.

Complete combustion is assured by the high initial temperature whileslagging crease evaporation and cooperates in the com- 7 bustionoperations. In the case of injected fuel the water arch cooperates withthe water bottombeneath as already described.

There has thus been described a furn'ace embodying the principles and.attaining the advantages of the present invention, being illustrativelyshown as a boiler furnace burning pulverized coal. Since many matters ofoperation, combination, arrangement and construction may be variouslymodified with out departing from the principles, the invention is notintendedto be limited to such matters except to the extent set forth inthe appended claims.

What is claimed is: I

1. In a pulverized fuel boiler furnace having a combustion chamber inwhich the boiler is exposed, a burner admitting fuel and'air in alateral direction through a lateral wall of the chamber, an arch abovethe burner exposed to the radiant heat, a bottom wall below the burnerexposed to the radiant heat, said arch andbottom being arranged'to'diverge in the direction of fuel admission, and water circulating tubesin both said-arch and bottom, in circulation with the boiler.

2. In a boiler furnace having a com ustion chamber, a burner admittingfuel through one of the lateral walls of the chamber, an archther'eabove exposed to the radiant heat, said arch having watercirculation passages arranged for high heat absorption, a slag screen ofspaced water tubes across the upper part of the furnace, and

connections between the water circulation.

passages and the slag screen tubes-soarranged that the'circulationpassages deliver to said slag screen.

3. A pulverized fuel boiler furnace comprising, walls. constituting acombustion chamber belowthe boiler, an arch,a=w'ater cooled bottom, ascreen of widely-spaced water tubes between the combustion zone and 1said injecting means exposedto the radiant heat, and having spaced watercirculation tubes arranged for radiant, heat absorption; 1

said arch being inclined upwardly away'iron the fuel injection point,and a closedfurna'ce bottom inclineddownwardly away from the fuelinjection point and havingwater circu- 1 lation passages "for absorptionof radiant heat, I p V JAY GOULD COUIANT.

